// https://syzkaller.appspot.com/bug?id=cf4c0a08d26692dc8f22b0fcc50db08fd17dd709
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>

#ifndef SYS_aio_writev
#define SYS_aio_writev 578
#endif

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 24; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (call == 3 || call == 6)
        break;
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    syscall(SYS_socket, /*domain=*/2ul, /*type=SOCK_STREAM*/ 1ul,
            /*proto=*/0x84);
    break;
  case 1:
    res = syscall(SYS_socket, /*domain=AF_INET6*/ 0x1cul,
                  /*type=SOCK_STREAM*/ 1ul, /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    *(uint32_t*)0x200000c0 = 0x101;
    syscall(SYS_setsockopt, /*fd=*/r[0], /*level=*/0xffff,
            /*optname=SO_SNDBUF*/ 0x1001, /*optval=*/0x200000c0ul,
            /*optlen=*/4ul);
    break;
  case 3:
    *(uint8_t*)0x20000140 = 0x1c;
    *(uint8_t*)0x20000141 = 0x1c;
    *(uint16_t*)0x20000142 = htobe16(0x4e23);
    *(uint32_t*)0x20000144 = 0;
    memset((void*)0x20000148, 0, 16);
    *(uint32_t*)0x20000158 = 0;
    syscall(SYS_bind, /*fd=*/r[0], /*addr=*/0x20000140ul, /*addrlen=*/0x1cul);
    break;
  case 4:
    *(uint32_t*)0x20000500 = r[0];
    *(uint64_t*)0x20000508 = 0;
    *(uint64_t*)0x20000510 = 0;
    *(uint64_t*)0x20000518 = 0;
    *(uint32_t*)0x20000520 = 4;
    *(uint32_t*)0x20000524 = 0;
    *(uint64_t*)0x20000528 = 0;
    *(uint32_t*)0x20000530 = 0;
    *(uint32_t*)0x20000534 = 4;
    *(uint64_t*)0x20000538 = 0x822e;
    *(uint64_t*)0x20000540 = 0;
    *(uint64_t*)0x20000548 = 0;
    *(uint32_t*)0x20000550 = 0;
    *(uint32_t*)0x20000554 = 0;
    *(uint64_t*)0x20000558 = 0xfffffffffffffffe;
    *(uint64_t*)0x20000560 = 0;
    *(uint64_t*)0x20000568 = 0x20000380;
    memcpy((void*)0x20000380, "\x3c\x88\x80", 3);
    syscall(SYS_aio_writev, /*iocb=*/0x20000500ul);
    break;
  case 5:
    *(uint8_t*)0x20000180 = 0x1c;
    *(uint8_t*)0x20000181 = 0x1c;
    *(uint16_t*)0x20000182 = htobe16(0x4e23);
    *(uint32_t*)0x20000184 = 0;
    memset((void*)0x20000188, 0, 16);
    *(uint32_t*)0x20000198 = 0;
    syscall(SYS_connect, /*fd=*/r[0], /*addr=*/0x20000180ul,
            /*addrlen=*/0x1cul);
    break;
  case 6:
    memset((void*)0x20000200, 14, 1);
    syscall(SYS_sendto, /*fd=*/r[0], /*buf=*/0x20000200ul, /*len=*/0xff66ul,
            /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 7:
    syscall(SYS_sendmsg, /*fd=*/r[0], /*msg=*/0ul, /*f=*/0ul);
    break;
  case 8:
    syscall(SYS_socket, /*domain=AF_INET*/ 2ul, /*type=SOCK_STREAM*/ 1ul,
            /*proto=*/0);
    break;
  case 9:
    res = syscall(SYS_socket, /*domain=*/2ul, /*type=SOCK_SEQPACKET*/ 5ul,
                  /*proto=*/0x84);
    if (res != -1)
      r[1] = res;
    break;
  case 10:
    syscall(SYS_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0ul,
            /*flags=O_RDWR*/ 2ul, /*mode=*/0ul);
    break;
  case 11:
    syscall(SYS_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0ul,
            /*flags=O_RDWR*/ 2ul, /*mode=*/0ul);
    break;
  case 12:
    syscall(SYS_socket, /*domain=*/2ul, /*type=SOCK_SEQPACKET*/ 5ul,
            /*proto=*/0x84);
    break;
  case 13:
    syscall(SYS_socket, /*domain=*/0x1cul, /*type=*/1ul, /*proto=*/0);
    break;
  case 14:
    syscall(SYS_shutdown, /*fd=*/-1, /*how=*/0ul);
    break;
  case 15:
    syscall(SYS_sendto, /*fd=*/-1, /*buf=*/0ul, /*len=*/0ul, /*f=*/0ul,
            /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 16:
    syscall(SYS_sendmsg, /*fd=*/-1, /*msg=*/0ul, /*f=*/0ul);
    break;
  case 17:
    syscall(SYS_rfork, /*flags=RFMEM|RFTHREAD|RFCFDG|RFNOWAIT*/ 0x3060ul);
    break;
  case 18:
    syscall(SYS_rfork, /*flags=RFMEM|RFTHREAD|RFCFDG|RFNOWAIT*/ 0x3060ul);
    break;
  case 19:
    syscall(SYS_openat, /*fd=*/0xffffff9cul, /*file=*/0ul,
            /*flags=O_APPEND*/ 8ul, /*mode=*/0ul);
    break;
  case 20:
    syscall(SYS_openat, /*fd=*/0xffffff9cul, /*file=*/0ul,
            /*flags=O_APPEND*/ 8ul, /*mode=*/0ul);
    break;
  case 21:
    syscall(SYS_connect, /*fd=*/r[1], /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 22:
    res = syscall(SYS_socket, /*domain=*/2ul, /*type=SOCK_STREAM*/ 1ul,
                  /*proto=*/0x84);
    if (res != -1)
      r[2] = res;
    break;
  case 23:
    syscall(SYS_getsockopt, /*fd=*/r[2], /*level=*/0x84, /*opt=*/0xc,
            /*val=*/0x20000140ul, /*len=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  use_temporary_dir();
  loop();
  return 0;
}